Final answer:
American troops were in Lebanon to restore order as part of a multinational peacekeeping force, following an Israeli invasion but were tragically killed by Hezbollah militants.
Step-by-step explanation:
The American troops killed in the Beirut bombing were stationed in Lebanon as part of a multinational peacekeeping force. In 1983, following an Israeli invasion, the Reagan administration sent soldiers to Lebanon to try to restore order. The attack on the barracks, which killed 241 servicemen, was carried out by Iranian-trained militants known as Hezbollah. This deployment underscored U.S. readiness to use military force abroad, a policy that also led to tragic consequences in other regions during the same period.